Two Controllers in One Case
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We get asked for 16 potentiometers fairly often. None of our products has that many in one unit. We built a 24 potentiometer model some time ago, but it is no longer in production.
New hardware is not something we can develop for a while, so instead we suggest combining what is already there. Two 8P2K units give you 16 potentiometers and 4 keys.
Putting two units side by side
Two units next to each other on a desk work fine, but they do not look like one instrument. There is a seam where the two cases meet, and the knob spacing inside one unit is 27 mm while the gap between the two units is something else.
So we made a case for it
This case holds two 8P2K boards. The two rows are placed so that the knobs sit 27 mm apart in both directions, the same spacing you already have inside a single unit.

The case is sent as a separate part, not assembled. You open your two 8P2K units, move the boards into the new case and close it. It is a matter of undoing a few screws. The original cases stay with you.
What to keep in mind
Two boards in one case are still two units. Each keeps its own USB-C port, and your computer sees two MIDI devices. You need two USB cables and two free ports on your computer or hub. The two boards cannot share a single cable.
In your DAW you register both devices. It is the same as using two controllers in Cubase or Ableton.
Other combinations
Some people want a different mix, such as 8 encoders together with 16 potentiometers. A case for that kind of layout is possible as well. Tell us what arrangement you need and we will let you know whether it can be done.